Case Study - Combined Heat and Power

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COMBINED HEAT AND POWER CASE STUDY

SITUATION
Swampscott High School, built in 2006, uses hot water
to heat their school buildings and a Senior Center.
With an annual 7,000 MMBtu hot water demand and
a good spark spread (ratio of electricity to gas price),
this was a good candidate for Combined Heat
and Power (CHP).

STRATEGY
Groom Energy engineers evaluated a natural-gas engine
driven CHP system that produces 510,000 Btu/hr of hot
water and 75 kW of electrical power. The combined
efficiency of the CHP system is 81%.

The system generates about 760 Massachusetts Alternative
Energy Credits (AECs) per year and, although the High School
does not benefit from tax incentives, when combined with
a great utility incentive, the CHP system has a 5-year
payback.

RESULTS